Radiant ray-sensitive lithographic printing plate precursor

a lithographic plate and precursor technology, applied in thermography, instruments, photosensitive materials, etc., can solve the problems of complex exposure and development, insufficient methods, complex apparatus,

Inactive Publication Date: 2001-07-05
FUJIFILM HLDG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0013] A third object of the present invention is to provide a lithographic printing plate precursor which is particularly eff

Problems solved by technology

These methods are not necessarily sufficiently satisfactory under the present conditions, although they are very useful in view of the rationalization of the printing process.
For example, in the above method (1) wherein an electrophotographic method is used, image-forming processes such as electric charge, exposure and development are complicated and the apparatus is intricate and large-scaled.
In method (2) of using a photopolymer, since a high sensitivity printing plate is used, handling of a printing plate in a bright room is difficult.
In method (3) of using silver salt, the treatment is complicated and there is such a drawback as silver is contained in a waste solution.
Method (4) requires post-heating and succeeding development, therefore, this method is also accompanied by complicated treatment.
However, this is a so-called development on a printing machine type plate whose non-exposed part of the photosensitive layer is removed during the printing process

Method used

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  • Radiant ray-sensitive lithographic printing plate precursor
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  • Radiant ray-sensitive lithographic printing plate precursor

Examples

Experimental program
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examples

[0039] A series of (i) a material capable of light / heat conversion and low melting point dispersed particles (e.g., wax particles) containing reaction component B which reacts with reaction component A, and (ii) a dispersion medium containing reaction component A. When the light energy given by radiant ray irradiation dissolves low melting point dispersed particles by light / heat conversion, reaction component A starts to contact with reaction component B in a molten liquid phase, a self-exothermic reaction continues without irradiation of radiant rays thereafter, and the separation of an image part from a non-image part progresses. The light / heat conversion material and reaction component B may be the same (e.g., a metal powder) or different series comprising other materials.

[0040] The following materials or material series can be exemplified as the analogous examples.

[0041] a. A series of (i) solid acid having a low melting point (e.g., a higher fatty acid) containing a light / heat ...

examples i-1 to i-8

[0186] Lithographic printing plate precursors comprising an iron powder as a material (a) having a light / heat conversion function and a self-exothermic reaction function, and a polymer compound generating a sulfonic acid by heating as a material (b) having a separating function of an image part from a non-image part were prepared.

[0187] Iron Fine Powder

[0188] The above-described alloy of iron fine powder having Fe / Co / Al / Y ratio of 100 / 20 / 5 / 5, a particle size having a long axis length of 0.1 .mu.m, a short axis length of 0.02 .mu.m, and a specific surface area of 60 m.sup.2 / g was kneaded in a continuous kneader with the polymer (polymer compound) shown below and dispersed using a sand mill.

[0189] Synthesis of Sulfonic Acid-Generating Type Polymer Compound

[0190] (1) Synthesis of Monomer (1)

[0191] Two hundred (200) ml of acetonitrile, 11 g of hexyl alcohol and 8.8 g of pyridine were put in a three neck flask having a capacity of 500 ml and stirred. Twenty point two (20.2) grams of viny...

example ii-1

[0200] The following compositions were put in a paint shaker (manufactured by Toyo Seiki Co., Ltd.) together with glass beads and dispersed for 60 minutes, and then glass beads were filtered, thereby a dispersion was obtained.

4 Iron fine particle powder 50 g Titanium oxide sol (30% solution) STS-01 167 g (manufactured by Ishihara Sangyo Kaisha Ltd.) Tetramethoxysilane (manufactured by 50 g Shin-Etsu Chemical Co., Ltd.) Concentrated hydrochloric acid 0.5 g (manufactured by Wako Pure Chemical Industries Ltd.) Ethanol 783 g Water 117 g

[0201] The above-prepared coating solution was coated on a PET support having a thickness of 188 .mu.m using a wire bar coater in coating weight of 1 g / m.sup.2, and then dried at 100.degree. C. for 10 minutes, thereby a lithographic printing plate precursor was obtained.

[0202] Iron Fine Particle Powder

[0203] Fe / Co / Al / Y ratio: 100 / 20 / 5 / 5

[0204] Particle size:

[0205] Long axis length: 0.1 .mu.m

[0206] Short axis length: 0.02 .mu.m

[0207] Specific surface area: ...

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Abstract

A radiant ray-sensitive lithographic printing plate precursor which comprises (a) material or material series which absorbs radiant rays, converts the absorbed radiant rays to heat, and enters into a self-exothermic reaction by the heat, and (b) material or material series which causes a chemical change or a physical change by the reaction heat generated as a result of the self-exothermic reaction.

Description

FIELD OF THE INVENTION[0001] The present invention relates to a lithographic printing plate precursor. Particularly, the present invention relates to a lithographic printing plate precursor from which a printing plate can be directly obtained by plate-making after image information has been, recorded by irradiation of heat mode radiant ray such as operation of an infrared laser etc. based on digital signals or by heat transfer via a thermal head without requiring additional operations.BACKGROUND OF THE INVENTION[0002] The following methods are conventionally known as methods of directly processing a printing plate from digitalized image data without a lith film: (1) a method by electrophotography, (2) a method of using a high sensitivity photopolymer capable of writing with a laser system of comparatively small output which emits blue or green light, (3) a method of using silver salt or a composite system of silver salt and other systems, and (4) a method in which acid is generated ...

Claims

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Application Information

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IPC IPC(8): B41C1/10B41M5/40B41M5/46
CPCB41C1/1041B41M5/46B41M5/465
Inventor FUKINO, KIYOTAKAKAWAMURA, KOICHIMAEMOTO, KAZUOKASAI, SEISHI
Owner FUJIFILM HLDG CORP
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